Graco 313876F User Manual download pdf (Page 34)

Rebuild

34 313876F

6. Insert new o-ring into spool air cylinder end cap.

7. Install proximity switch.

8. Apply Krytox or compatible lubricant to cylinder.

9. Insert piston into cylinder with the u-cup lip pointed

in the direction of the tapered end of the cylinder.

The “U” points toward the air inlet.

10. Careful not to cut the o-ring, install pneumatic spool

blocks.

11. Install the two cap screws.

12. Repeat for opposite side pneumatic spool rod drive.

Wetted Section Rebuild

1. Perform Wetted Section Disassembly, page 30.

2. Remove spool rods and sleeves from the metering

block.

NOTE: The spool sleeve can be removed by sliding the

sleeve in the direction of the identification marking.

3. Remove the pneumatic drive spool bearing, seals,

and seal retainer for both spools.

4. Inspect the metering rod and sleeve assemblies and

the spool rod and sleeve assemblies for excessive

wear. If there are any scratches on the rod that can

be felt by a fingernail, replace the rod and sleeve

assembly.

5. Clean all wetted components thoroughly with com-

patible solvent.

Air Inlet O-ring

Cap Screws

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Graco 313876F User Manual Page 34